/** @file

  Internal definitions for the virtio-net driver, which produces Simple Network
  Protocol instances for virtio-net devices.

  Copyright (C) 2013, Red Hat, Inc.
  Copyright (c) 2017, AMD Inc, All rights reserved.<BR>

  SPDX-License-Identifier: BSD-2-Clause-Patent
**/

#ifndef _VIRTIO_NET_DXE_H_
#define _VIRTIO_NET_DXE_H_

#include <IndustryStandard/VirtioNet.h>
#include <Library/DebugLib.h>
#include <Library/VirtioLib.h>
#include <Protocol/ComponentName.h>
#include <Protocol/ComponentName2.h>
#include <Protocol/DevicePath.h>
#include <Protocol/DriverBinding.h>
#include <Protocol/SimpleNetwork.h>
#include <Library/OrderedCollectionLib.h>

#define VNET_SIG  SIGNATURE_32 ('V', 'N', 'E', 'T')

//
// maximum number of pending packets, separately for each direction
//
#define VNET_MAX_PENDING  64

//
// State diagram:
//
//                  |     ^
//                  |     |
//        BindingStart  BindingStop
//        +SnpPopulate    |
//        ++GetFeatures   |
//                  |     |
//                  v     |
//                +---------+    virtio-net device is reset, no resources are
//                | stopped |    allocated for traffic, but MAC address has
//                +---------+    been retrieved
//                  |     ^
//                  |     |
//            SNP.Start SNP.Stop
//                  |     |
//                  v     |
//                +---------+
//                | started |    functionally identical to stopped
//                +---------+
//                  |     ^
//                  |     |
//       SNP.Initialize SNP.Shutdown
//                  |     |
//                  v     |
//              +-------------+  Virtio-net setup complete, including DRIVER_OK
//              | initialized |  bit. The receive queue is populated with
//              +-------------+  requests; McastIpToMac, GetStatus, Transmit,
//                               Receive are callable.
//

typedef struct {
  //
  // Parts of this structure are initialized / torn down in various functions
  // at various call depths. The table to the right should make it easier to
  // track them.
  //
  //                          field              init function
  //                          ------------------ ------------------------------
  UINT32                         Signature;      // VirtioNetDriverBindingStart
  VIRTIO_DEVICE_PROTOCOL         *VirtIo;        // VirtioNetDriverBindingStart
  EFI_SIMPLE_NETWORK_PROTOCOL    Snp;            // VirtioNetSnpPopulate
  EFI_SIMPLE_NETWORK_MODE        Snm;            // VirtioNetSnpPopulate
  EFI_EVENT                      ExitBoot;       // VirtioNetSnpPopulate
  EFI_DEVICE_PATH_PROTOCOL       *MacDevicePath; // VirtioNetDriverBindingStart
  EFI_HANDLE                     MacHandle;      // VirtioNetDriverBindingStart

  VRING                          RxRing;          // VirtioNetInitRing
  VOID                           *RxRingMap;      // VirtioRingMap and
                                                  // VirtioNetInitRing
  UINT8                          *RxBuf;          // VirtioNetInitRx
  UINT16                         RxLastUsed;      // VirtioNetInitRx
  UINTN                          RxBufNrPages;    // VirtioNetInitRx
  EFI_PHYSICAL_ADDRESS           RxBufDeviceBase; // VirtioNetInitRx
  VOID                           *RxBufMap;       // VirtioNetInitRx

  VRING                          TxRing;           // VirtioNetInitRing
  VOID                           *TxRingMap;       // VirtioRingMap and
                                                   // VirtioNetInitRing
  UINT16                         TxMaxPending;     // VirtioNetInitTx
  UINT16                         TxCurPending;     // VirtioNetInitTx
  UINT16                         *TxFreeStack;     // VirtioNetInitTx
  VIRTIO_1_0_NET_REQ             *TxSharedReq;     // VirtioNetInitTx
  VOID                           *TxSharedReqMap;  // VirtioNetInitTx
  UINT16                         TxLastUsed;       // VirtioNetInitTx
  ORDERED_COLLECTION             *TxBufCollection; // VirtioNetInitTx
} VNET_DEV;

//
// In order to avoid duplication of interface documentation, please find all
// leading comments near the respective function / variable definitions (not
// the declarations here), which is where your code editor of choice takes you
// anyway when jumping to a function.
//

//
// utility macros
//
#define VIRTIO_NET_FROM_SNP(SnpPointer) \
        CR (SnpPointer, VNET_DEV, Snp, VNET_SIG)

#define VIRTIO_CFG_WRITE(Dev, Field, Value)  ((Dev)->VirtIo->WriteDevice (  \
                                                (Dev)->VirtIo,              \
                                                OFFSET_OF_VNET (Field),     \
                                                SIZE_OF_VNET (Field),       \
                                                (Value)                     \
                                                ))

#define VIRTIO_CFG_READ(Dev, Field, Pointer)  ((Dev)->VirtIo->ReadDevice (  \
                                                (Dev)->VirtIo,              \
                                                OFFSET_OF_VNET (Field),     \
                                                SIZE_OF_VNET (Field),       \
                                                sizeof *(Pointer),          \
                                                (Pointer)                   \
                                                ))

//
// component naming
//
extern EFI_COMPONENT_NAME_PROTOCOL   gVirtioNetComponentName;
extern EFI_COMPONENT_NAME2_PROTOCOL  gVirtioNetComponentName2;

//
// driver binding
//
extern EFI_DRIVER_BINDING_PROTOCOL  gVirtioNetDriverBinding;

//
// member functions implementing the Simple Network Protocol
//
EFI_STATUS
EFIAPI
VirtioNetStart (
  IN EFI_SIMPLE_NETWORK_PROTOCOL  *This
  );

EFI_STATUS
EFIAPI
VirtioNetStop (
  IN EFI_SIMPLE_NETWORK_PROTOCOL  *This
  );

EFI_STATUS
EFIAPI
VirtioNetInitialize (
  IN EFI_SIMPLE_NETWORK_PROTOCOL  *This,
  IN UINTN                        ExtraRxBufferSize  OPTIONAL,
  IN UINTN                        ExtraTxBufferSize  OPTIONAL
  );

EFI_STATUS
EFIAPI
VirtioNetReset (
  IN EFI_SIMPLE_NETWORK_PROTOCOL  *This,
  IN BOOLEAN                      ExtendedVerification
  );

EFI_STATUS
EFIAPI
VirtioNetShutdown (
  IN EFI_SIMPLE_NETWORK_PROTOCOL  *This
  );

EFI_STATUS
EFIAPI
VirtioNetReceiveFilters (
  IN EFI_SIMPLE_NETWORK_PROTOCOL  *This,
  IN UINT32                       Enable,
  IN UINT32                       Disable,
  IN BOOLEAN                      ResetMCastFilter,
  IN UINTN                        MCastFilterCnt    OPTIONAL,
  IN EFI_MAC_ADDRESS              *MCastFilter      OPTIONAL
  );

EFI_STATUS
EFIAPI
VirtioNetStationAddress (
  IN EFI_SIMPLE_NETWORK_PROTOCOL  *This,
  IN BOOLEAN                      Reset,
  IN EFI_MAC_ADDRESS              *New OPTIONAL
  );

EFI_STATUS
EFIAPI
VirtioNetStatistics (
  IN EFI_SIMPLE_NETWORK_PROTOCOL  *This,
  IN BOOLEAN                      Reset,
  IN OUT UINTN                    *StatisticsSize   OPTIONAL,
  OUT EFI_NETWORK_STATISTICS      *StatisticsTable  OPTIONAL
  );

EFI_STATUS
EFIAPI
VirtioNetMcastIpToMac (
  IN EFI_SIMPLE_NETWORK_PROTOCOL  *This,
  IN BOOLEAN                      IPv6,
  IN EFI_IP_ADDRESS               *Ip,
  OUT EFI_MAC_ADDRESS             *Mac
  );

EFI_STATUS
EFIAPI
VirtioNetNvData (
  IN EFI_SIMPLE_NETWORK_PROTOCOL  *This,
  IN BOOLEAN                      ReadWrite,
  IN UINTN                        Offset,
  IN UINTN                        BufferSize,
  IN OUT VOID                     *Buffer
  );

EFI_STATUS
EFIAPI
VirtioNetGetStatus (
  IN EFI_SIMPLE_NETWORK_PROTOCOL  *This,
  OUT UINT32                      *InterruptStatus OPTIONAL,
  OUT VOID                        **TxBuf OPTIONAL
  );

EFI_STATUS
EFIAPI
VirtioNetTransmit (
  IN EFI_SIMPLE_NETWORK_PROTOCOL  *This,
  IN UINTN                        HeaderSize,
  IN UINTN                        BufferSize,
  IN /* +OUT! */ VOID             *Buffer,
  IN EFI_MAC_ADDRESS              *SrcAddr  OPTIONAL,
  IN EFI_MAC_ADDRESS              *DestAddr OPTIONAL,
  IN UINT16                       *Protocol OPTIONAL
  );

EFI_STATUS
EFIAPI
VirtioNetReceive (
  IN EFI_SIMPLE_NETWORK_PROTOCOL  *This,
  OUT UINTN                       *HeaderSize OPTIONAL,
  IN OUT UINTN                    *BufferSize,
  OUT VOID                        *Buffer,
  OUT EFI_MAC_ADDRESS             *SrcAddr    OPTIONAL,
  OUT EFI_MAC_ADDRESS             *DestAddr   OPTIONAL,
  OUT UINT16                      *Protocol   OPTIONAL
  );

//
// utility functions shared by various SNP member functions
//
VOID
EFIAPI
VirtioNetShutdownRx (
  IN OUT VNET_DEV  *Dev
  );

VOID
EFIAPI
VirtioNetShutdownTx (
  IN OUT VNET_DEV  *Dev
  );

VOID
EFIAPI
VirtioNetUninitRing (
  IN OUT VNET_DEV  *Dev,
  IN OUT VRING     *Ring,
  IN     VOID      *RingMap
  );

//
// utility functions to map caller-supplied Tx buffer system physical address
// to a device address and vice versa
//
EFI_STATUS
EFIAPI
VirtioNetMapTxBuf (
  IN  VNET_DEV              *Dev,
  IN  VOID                  *Buffer,
  IN  UINTN                 NumberOfBytes,
  OUT EFI_PHYSICAL_ADDRESS  *DeviceAddress
  );

EFI_STATUS
EFIAPI
VirtioNetUnmapTxBuf (
  IN  VNET_DEV              *Dev,
  OUT VOID                  **Buffer,
  IN  EFI_PHYSICAL_ADDRESS  DeviceAddress
  );

INTN
EFIAPI
VirtioNetTxBufMapInfoCompare (
  IN CONST VOID  *UserStruct1,
  IN CONST VOID  *UserStruct2
  );

INTN
EFIAPI
VirtioNetTxBufDeviceAddressCompare (
  IN CONST VOID  *StandaloneKey,
  IN CONST VOID  *UserStruct
  );

//
// event callbacks
//
VOID
EFIAPI
VirtioNetIsPacketAvailable (
  IN  EFI_EVENT  Event,
  IN  VOID       *Context
  );

VOID
EFIAPI
VirtioNetExitBoot (
  IN  EFI_EVENT  Event,
  IN  VOID       *Context
  );

#endif // _VIRTIO_NET_DXE_H_